the reality of automotive audio in the age of e-mobility€¦ · the reality of automotive audio in...

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The Reality of Automotive Audio in the Age of E-Mobility

The role of audio in the automotive industry has significantly changed. Sound systems are not only part of the infotainment system, they are also used to shape the sound of cars, i.e. the sound of the car itself due to its motion and therefore the generation of sound (usually called noise). Especially for electrical powertrains this is a completely new world.

The conference will give an overview of progress since the last conference two years ago and addresses many of the new requirements in this emerging field of audio. For example, as of September 2019, there are legal requirements for electrical cars to generate sound for the perception of vehicles by pedestrians. OEMs, suppliers as well as researchers will present and discuss their solutions to fulfill legal requirements and customer satisfaction.

List of Contents: • Sponsors • Preliminary program • Available abstracts preliminary program

AES 2019 International Conference on Automotive Audio Sept 11 – Sept 13, 2019 at Audi Driving Experience Center, Neuburg a. d. Donau, Germany

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SPONSORS PLATINUM SPONSORS

GOLD SPONSORS


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PRELIMINARY PROGRAM

Wednesday, Sept 11, 2019

Time Topic Location ADEC*

07:00 - 09:00 AM Opening Conference Registration & Welcome Morning Coffee Lobby

08:00 AM Demo & Exhibition Open [All day] Ground Floor

09:00 - 09.15 AM Opening Comments Chairman of the AES Technical Committee for Automotive Audio Dr. Alfred Svobodnik (Mvoid)

Meeting room first floor

09:15 - 10:00 AM Opening Keynote: The Holistic User Experience Ivo Muth, Vice President User Experience/User Interface (Audi)


10:00 - 10:30 AM Paper Session 1: Self-Testing of Car Audio Systems; Authors: Stefan Irrgang and Wolfgang Klippel (Klippel)


10:30 - 11:00 AM Morning Coffee First floor

11:00 - 11:30 AM

Paper Session 2: A Software-Centric Solution to Automotive Audio for General Purpose CPUs; Authors: Mark Every, Len Layton and Jose Maria Marin (Blackberry QNX)


11:30 - 12:00 PM

Paper Session 3: Automotive Microphone Performance: from Specification to User Experience Authors: Yu Du, Viktor Dobos, Balazs Varga and Ruiting Yang (Harman)


12:00 - 1:30 PM Lunch First floor

1:30- 2:00 PM Invited Paper: Title tbd Meeting room first floor

2:00 - 3:00 PM

Tutorial: Testing Voice-Controlled & Smartphone Integrated Infotainment Systems; Steve Temme (Listen Inc.)



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3:00 - 3:30 PM

Paper Session 4: Virtual Tuning – A Mixed Approach Based on Measured RTFs; Authors: Hans Lahti (Harman) and Adrian Bahne (Dirac)


3:30 - 4:00 PM Afternoon Coffee First floor

4:00- 4:30 PM

Paper Session 5: Virtual Reality Experience for the Optimization of a Car Audio System; Authors: Michael J. Strauss, Francois Malbos and Michal Bogdanski (Harman)


4:30 - 5:00 PM

Paper Session 6: Analysis of Performance Variances in Production Vehicles Using Digital Twins; Authors: Alfred Svobodnik, Tommaso Nizzoli, Roger Shively, Marc-Olivier Chauveau, Robert Weiser (Mvoid)


5:00 PM End of Conference Day

*ADEC = Audi Driving Experience Center


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Thursday, Sept 12, 2019



08:30 - 08:45 AM Opening Comments Meeting room first floor

08:45 - 09:30 AM Keynote: Audio Engineering in Today’s Automotive Industry: from Technical Performance to Sound Quality; Laurent Gagliadrini (PSA Peugeot Citroën)


09:30 - 10:00 AM

Paper Session 7: On the Impact of Next Generation of Automotive Radio Tuners on Active Noise Cancellation and Engine Sound Enhancement System Capabilities; Authors: Stefan Kerber, Rolf Schirmacher, Katharina Schmidt, Rita Reger and Qian Ni (Müller-BBM)


10:00 - 10:30 AM Morning Coffee First floor

10:30 - 11:00 AM

Paper Session 9: Acoustic Echo Reduction in Automotive: Review and Contribution; Authors: Luis Weruaga, Mathias Lehnfeld and Stefano Bider (proactiveaudio)


11:00 - 11:30 AM Paper Session 10: Evaluation Criteria for Engine Harmonic Cancellation; Authors: Davis Pan (Bose)


11:30 - 1:00 PM Lunch First floor

10:00 - 1:00 PM In parallel: R8 Driving Experience/Audi e-tron Taxi Drive Offroad Course

Outdoor Audi Course

1:00 - 1:30 PM Invited Paper: Title tbd Meeting room first floor

1:30 - 2:45 PM Tutorial: Design and Implementation of Electric Vehicle Sound; Marijn Kooy (Müller-BBM)


2:45 - 3:15 PM Afternoon coffee First floor


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2:45 - 3:15 PM parallel to

afternoon coffee

Paper Session 8 (Poster): Evaluating Binaural Simulations of a Premium Automotive Sound System; Authors: Eva Hasenberger, Gerhard Krump and Martin Schneider (Fraunhofer IIS)


3:15 - 4:45 PM

Panel Discussion: Automotive Audio System - Today and in Future - Holistic System Design; Participants: Wolfram Jaehn (Audi), Markus Koch (Byton), Adrian Bahne (Dirac), Martin Olsen (Harman), Pat Dennis (Nissan), Jose Marin (QNX), Thomas Wuerdinger (BMW), Jonatan Ewald (Volvo) Moderator: Greg Sikora (Harman)


4:45 - 6:00 PM

Panel Discussion: Sound Reproduction on Wheels: Aesthetics & Challenges in Automotive Moderator: R. Kassier (Harman), Panelists tbd


2:00 - 6:00 PM In parallel: Sound-Demos on the Road/Audi Grounds Outdoor

6:00 PM Barbecue First floor / balcony

10.00 PM End of Conference Day


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Friday, Sept 13, 2019



08:30 - 08:45 AM Opening Comments Meeting room first floor

08:45 - 09:30 AM Keynote: Immersive Audio Listening Experience in Cars – the Future of Music Dr.-Ing. Bernhard Grill (Fraunhofer IIS)


09:30 - 10:30 AM

Workshop: Assessment of Sound Systems; Pat Dennis (Nissan), Jonathan Ewald (Volvo) Moderator: Lars Carlsson (Dirac)


10:30 - 11:00 AM Morning Coffee First Floor

11:00 - 11:45 AM Journalists Panel Moderator: Dr. A. Svobodnik (Mvoid)


11:45 - 12:15 PM Paper Session 11: Segmented Mass Loading for Loudspeaker Cones; Author: Karel Goossens (Premium Sound Solutions)


12:15 - 1:45 PM Lunch First Floor

1:45 - 2:15 PM

Invited Paper: Extending the Bandwidth of Local Active Noise Control in the Automotive Environment Using Headtracking; Dr. Jordan Cheer (Signal Processing and Control Group, Institute of Sound and Vibration Research, University of Southampton)


2:15 - 2:45 PM

Paper Session 12: Different Approaches for High Pass and Low Pass Biquad Filters with Pre/Post Limiter Design; Authors: Marcin Kalinowski and Matteo Nucci (Harman)


3:00 PM End of Conference


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ABSTRACTS 11.09.2019 09:15 – 10:00 AM

Keynote: The Holistic User Experience Keynote Speaker: Ivo Muth Audi AG, Vice President User Experience/User Interface The user experience (UX) customers expect from their automobile is at a turning point. While in the past, especially horsepower and exterior features dominated the emotional experience of cars, in the future the interaction space in the interior will be the main constituent of the costumer UX. In order to prevail as a premium brand in this new competitive environment, automotive manufacturers have to offer a holistic and stunning UX in which an impression for all human senses is orchestrated.

11.09.2019 10:00 – 10:30 AM

Self-Testing of Car Audio Systems Authors: Stefan Irrgang, Wolfgang Klippel (both Klippel GmbH) All hardware components required for a test system that checks the quality of the audio system in cars are actually already available in modern cars: DSP, converters, sensors, transducers and connecting links. However, they are not designed as test system components but may be used as such. Smart amplifiers and loudspeaker control technologies are of special interest for this approach. They provide powerful means to improve transducer properties like robustness, linearity, and bandwidth. By definition, they identify loudspeaker parameters and states. Such valuable information can be exploited for test and measurement tasks such as design qualification, end-of-line testing, quality assurance, long-term monitoring and ensuring safety relevant features (e.g. pedestrian warning systems). This paper investigates benefits and challenges of this approach.

11.09.2019 11:30 – 12:00 PM

Automotive Microphone Performance: from Specification to User Experience Authors: Yu Du, Viktor Dobos, Balázs Varga and Ruiting Yang (all Harman) This paper discusses the correlations between microphone specifications defined and measured in laboratory conditions and the perceived user experience of automotive applications such as in-car voice communication and array beamforming. Experimental recordings are obtained using three common automotive microphone types in three vehicles under various driving conditions. Speech intelligibility index and subjective listening methods are used to evaluate the communication quality of microphones with different frequency responses, signal-to-noiseratios (SNR) and acoustic overload points (AOP). It is shown that advanced SNR and AOP specifications may not necessarily lead to better user experience due to limitations of automotive application environments.


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For beamforming performance, a simulation model is used to study the effects of microphone element sensitivity and phase mismatches, which shows different performance sensitivity depending on the complexity of array processing algorithms. Results in this study help users choose proper microphone elements for targeted applications.

11.09.2019 11:00 – 11:30 AM

A Software-Centric Solution to Automotive Audio for General Purpose CPUs Authors: Mark Every, Len Layton and Jose Maria Marin (all BlackBerry/QNX) Current automotive audio systems are in general distributed systems, both in terms of hardware and functionality. An automotive audio system may contain several DSPs, microprocessors and general purpose multi-core CPUs, with increasingly complex functionality split between processing cores. There are many situations where audio signals need to be passed back and forth between cores, such as for mixing or acoustic echo cancellation, and timing, synchronization, data formats and other discrepancies between components have to be managed, which adds significant complexity and makes the whole system more fragile and inextensible. Some reasons for this division of tasks are historical; in the past, specialized DSPs for audio equalization, filtering, etc. were required to offload the main application processors, and functions such as audio chimes have to boot-up quickly and meet more stringent safety requirements than entertainment signals. Nowadays, general purpose multi-core CPUs (referred to here as GP CPUs), such as ARM or Intel/AMD processors, have advanced considerably and many automotive SoCs feature GP CPUs that run at 2 GHz or more, but the DSP typically remains below 1 GHz. Consolidating audio processing functionality on a single GP CPU with QNX Acoustics Management Platform (AMP) reduces system cost and complexity, improves reliability, accelerates time to market, provides standards-compliance, and brings capabilities and performance to new levels.

11.09.2019 3:00 – 3:30 PM

Virtual Tuning – A mixed approach based on measured RTFs Authors: Hans Lahti (Harman), and Dr. Adrian Bahne (Dirac Research) Constant introduction of new technologies and features in combination with increasingly advanced automotive sound system designs yield challenges for the automotive sound tuning process. Virtual tuning processes are a hot topic in the industry. The main objective is to be less dependent on car availability and allow for early prototyping. In this paper, we present a mixed in-situ/virtual approach that can easily be extended to a full virtual process. The mixed approach presented is implemented today and clearly shows the benefits inherent to a virtual tuning workflow. The match between the presented approach and in-situ validation measurements is investigated and indicates the validity and usability of the presented approach.


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11.09.2019 4:00 – 4:30 PM

Virtual Reality Experience for the Optimization of a Car Audio System Authors: M. Strauss, M. K. Bogdanski, and F. Malbos (all Harman) Harman created a new, realistic and advanced Virtual Reality (VR) experience of a car audio system. In this VR setup, the auditory cues and the visual representation are only based on advanced simulations techniques and CAD input data. The VR increases the level of realism and completes the experience of sitting and evaluating a car audio system. Switching through the speakers or visualize simulated data is possible while staying in the virtual reality. The visualization of simulated data offers a new way of understanding and optimizing audio systems for vehicle in development phase in OEM.

11.09.2019 4:30 – 5:00 PM

Analysis of Performance Variances in Production Vehicles Using Digital Twins Authors: Alfred J. Svobodnik, Tommaso Nizzoli, Roger Shively, Marc-Olivier Chauveau and Robert Weiser (all Mvoid) Audio systems in production vehicles are known to exhibit vehicle to vehicle performance variance. A comparison study eliminated measurement uncertainty by utilizing a digital twin method where only one attribute is modified between comparisons. Utilizing loudspeaker drivers from within manufacturing tolerance, system comparisons were made with loudspeakers that have reduced or increased sensitivity. The impact of a missing gasket was analyzed as well.


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12.09.2019 08:45 – 09:30 AM

Keynote: Audio engineering in today’s automotive industry: from technical performance to sound quality Keynote Speaker: Laurent Gagliadrini PSA Peugeot Citroën DQI/DAPF/NVH Department for Quality and Engineering /Physical and Functional Architecture Division/Noise,Vibrations and Harshness Automotive audio distinguishes from the consumer audio mainly because it is designed up to the listeners ears, with a possible control of any of the vehicle system’s component. In today’s engineering process (Product Lifecycle Management based) automotive systems architects have to ensure the achievement of customers’ expectations through cascading requirements. For this purpose, performances of the vehicle, of the audio system and its components have to be defined consistently, and in relation with the quality of the audio system, as the user perceives it. Such a process becomes much easier when objective metrics related to the sound quality exist. After a review of the perceived quality dimensions that we consider to handle the vehicle system design regarding audio issues, some technical (audio) performances can be set-up at the different engineering levels. Nevertheless, sound quality itself remains mostly a subjective matter. New indicators are then proposed to handle some of the sound quality dimensions. In order to be integrated in the engineering process, these indicators may apply to the whole system (including acoustic propagation in the cabin) as well as single electronic/software components. At the moment, they are limited to monophonic signals and tackle both spectral and dynamic (temporal) effects. After those indicators are defined, the results of their subjective assessment by an expert jury will be presented.

12.09.2019 09:30 – 10:00 AM

On the Impact of Next Generation of Automotive Radio Tuners on Active Noise Cancellation and Engine Sound Enhancement System Capabilities Authors: Stefan Kerber, Rolf Schirmacher, Katharina Schmidt, Rita Reger (all Müller BBM), and Qian Ni (NXP Semiconductors Germany) Active Noise Cancellation (ANC) and Engine Sound Enhancement (ESE) nowadays are proven standard technologies for low frequency engine noise reduction and sound quality enhancement for conventional as well as modern electric and hybrid electric powertrains. They make use of audio system components to generate the required acoustical output to the vehicle interior. As these technologies define the acoustical character and attributes of the vehicle and its powertrain, their application and the resulting sound must not depend on the actual vehicle audio system level. Therefore, integration of these technologies within the vehicle head-unit, which is typically independent of the actual audio level, is a preferred solution to reduce overall system development and integration complexity. This integration strategy has been strongly supported by the inclusion of freely programmable, open DSP cores within a radio-audio one-chip as e.g. the NXP Dirana3. Currently the next generation of such radio-audio one-chip becomes available. They show significant changes on their open DSP cores which are used for ANC and ESE processing, including newer generation of DSP cores and significant changes on the memory availability and layout. This paper analyses and discusses the impact of the new generation of tuner System-on-Chips


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(SoCs) on the actual ANC and ESE performance in production vehicles, based on existing software implementations and with a strong focus on the additional system capabilities that will become available for NVH noise management engineers in terms of system flexibility and sound options.

12.09.2019 10:30 – 11:00 AM

Acoustic Echo Reduction in Automotive: Review and Contribution Authors: Luis Weruaga, Mathias Lenhfeld, and Stefano Bider (all proactivaudio GmbH) Acoustic echo reduction represents a key enabling feature in advanced automotive audio systems. This paper includes a review of the state of art in the field, highlighting how latest proposals still struggle with the demanding acoustic conditions of vehicles. A recently-disclosed application, filed by this very paper affiliation, proposes a novel framework to effectively tackle such challenges. Its solid foundations along with the validation in both controlled and real automotive scenarios support the idea that this technology may be more than an evolution.

12.09.2019 2:45 – 3:15 PM

Evaluating Binaural Simulations of a Premium Automotive Sound System Authors: Eva Hasenberger1, Gerhard Krump2, and Martin Schneider1,3 1 Fraunhofer Institute for Integrated Circuits IIS, 2 Deggendorf Institute of Technology, 3 International Audio Laboratories Erlangen The sound field excited by high fidelity (hi-fi) audio systems depends on the loudspeaker drivers, their positioning, their enclosures and the listening room. In the case of in-car sound systems, the listening room is the car cabin and its influence is much more pronounced than in typical living-room scenarios. Thus, the user experience results from a complex auditory scene. In certain situation it is desirable to simulate the resulting auditory scene by means different than the actual audio system, e. g. by using binaural synthesis. In this study, a state-of-the-art binaural synthesis system for living-room scenarios was evaluated with respect to simulate a premium automotive audio system. To this end, listening tests were designed that can identify potential perceptual differences between the original audio system and its simulation. The evaluated aspects include temporal, spectral and spatial attributes. The results show that a convincing simulation of in-car sound systems through binaural headphone reproduction appears to be possible with regard to the evaluated aspects.


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13.09.2019 08:45 – 09:30 AM

Keynote: Immersive Audio Listening Experience in Cars – the Future of Music Keynote Speaker: Dr.-Ing. Bernhard Grill Fraunhofer IIS, Director with focus on Audio and Media Technologies With the announcement of the 360 Reality Audio initiative from Sony at CES 2019, music listening will soon see its first signs of shift from current 2-channel stereo to truly immersive 3D audio. Immersive audio formats such as MPEG-H that powers 360 Reality Audio, make it possible for artists and music creators to create a 360-degree musical experience by mapping sound sources such as vocals, chorus and instruments with positional information of distance and angle to suit their creative and artistic purpose. When listeners play back the resulting content, they can enjoy a music experience that immerses them in sound from every direction as intended by the content creator. Being able to listen to the latest 3D audio mixes of the most popular recording artist on mobile devices with headphones, on 3D soundbars in consumers’ homes and now also in cars, will provide audiences with a seamless immersive experience across playback devices and environments. Having developed and deployed the high-end 3D sound algorithm Symphoria, Fraunhofer IIS has already raised the quality of conventional stereo music played back in cars. With the upcoming availability of immersive music content for in-car environments thanks to MPEG-H 3D Audio format such as 360 Reality Audio, premium automotive sound systems will soon have access to a premium content source. This will undoubtedly improve the consumer experience of music in cars even further and therefore drive demand for premium sound systems.

13.09.2019 11:45 – 12.15 PM

Segmented mass loading for loudspeaker cones Author: Karel Goossens (Premium Sound Solutions) Common loudspeaker cones have axisymmetric geometry and are made of isotropic cone materials, such as paper. This leads to dominant radial cone breakup modes with ring-shaped vibration patterns that create peaks and dips in the frequency response. By adding local masses on the cone in a circle segment configuration, the isotropy is broken due to non-axisymmetric inertial forces. Consequently, the patterns of the breakup modes are changed from ring shaped zones into irregular areas with in-phase and out-of-phase contributions to the sound pressure that cancel each other partially. This leads to a smoothing of the SPL response.

13.09.2019 1:45 – 2:15 PM

Extending the bandwidth of local active noise control in the automotive environment using headtracking Author: Dr. Jordan Cheer (Signal Processing and Control Group, Institute of Sound and Vibration Research, University of Southampton)


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Active control of both engine and road noise in the automotive environment was demonstrated more than 30 years ago, however, the commercial uptake of these systems has been somewhat limited. This can in general be attributed to the ratio between the cost of implementation and the performance of the system. Recently, active control systems have seen some commercial automotive applications due to a relative reduction in their cost, however, the performance of these systems is still generally limited to frequencies below a couple of hundred hertz. This paper presents an investigation into extending the upper frequency limit of an active control system through the use of a localised system with headtracking technology.

the reality of automotive audio in the age of e-mobility€¦ · the reality of automotive audio in...

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